Neurotec.Gui.dll lets you use NView classes like NFaceView, which automatically uses data in NFace object to draw additional information on screen. Those classes are used in our samples("SDK\Samples") and there is no documentation about them as they are very straightforward classes(only references are in our samples) - e.g. you set NFace object to NFaceView and image from NFace will be displayed as well as rectangle(if face is detected), additionally you can turn on/off features which you want to be displayed or not.